Caulking your hardie siding after it is installed is one of the most important parts of the installation process. Caulk will ensure that water will not penetrate between the seams of the hardy siding, or where the hardy siding butts up against your window and door trim. Caulking is a big part of correctly installing hardie board correctly.
It is now recommended that caulk be placed in the seams while you are installing it, not after. So what this means is that before you butt two pieces of hardy siding together, you need to apply a thick bead of caulk to the edge of the hardy pieces that will be touching. Apply the caulking and push the seams tight, allowing the caulk to seal the seam tightly. After the pieces of hardie board are installed, take a damp rag and wipe away access caulking.
What kind of caulking should I use on hardie plank siding? Many people wonder what the best, or more importantly the correct kind of caulking to use is. If you want your finished home siding to keep out wind driven rain, and snow, you need to use a caulking that will remain permanently flexible. If a caulk if made to stay flexible, it will say so right on the tube. Make sure to look for this when you buy caulking.
After you have caulked your hardie plank siding, it is important to allow the caulking to dry the recommended amount of time on the tube. Each manufacturer or brand of caulking is different, so make sure you read the directions. Why is it important to allow the caulk to dry first? This will help the caulking take paint better. If you paint caulk before it is completely dry, it will continue to shrink, causing your paint to crack and chip.
Another important tip about caulking your hardie plank siding, is to remember that anywhere your hardy siding butts up against a wood material, such as door and window trim, you need to leave a gap. This gap needs to be 1/8″ to allow the wood to swell and contract. This is one of the reasons you are using a permanently flexible caulking.
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